Magnetic interactions in the molecular multiferroic compound (NH4)2[Fe Cl5 (H2O)]
The recent observation of multiferroic behaviour in the compound (NH4)2[FeCl5(H2O)] has stimulated the interest in the study of the mechanisms governing the magnetic interactions in this system. This material orders magnetically at TN= 7.25 K and multiferrocity occurs below ca. 6.9 K with the onset of ferroelectric order. Recently, we have studied by neutron diffraction the magnetic structure of the deuterated compound, (ND4)2[FeCl5·(D2O)]. At low temperature it has been observed a cycloidal magnetic structure propagating in the c-axis and with the magnetic moments lying in the ac plane. In the region between 7.25 K and 6.9 K a sinusoidal spin configuration is likely taking place. Determining experimentally the possible magnetic interactions will help us to precisely understand the origin of the magnetic structure and ultimately the multiferroic behaviour. Also, the possible observation of low energy magnons can allow us to identify those modes which may directly couple to the ferroelectric polarization. Therefore, the purpose of this proposal is to investigate by inelastic neutron scattering magnon spectrum of (ND4)2[FeCl5(D2O)].
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RODRIGUEZ VELAMAZAN Jose Alberto; J Campo; CHAPON Laurent; FABELO ROSA Oscar Ramon; MAZZUCA Lidia and OLLIVIER Jacques. (2016). Magnetic interactions in the molecular multiferroic compound (NH4)2[Fe Cl5 (H2O)]. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.4-01-1504
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